Philetus warren gates



(No ModeL) P. W. GATES. REMOVABLE TEEAD EOE SCREENING AND ASSORTINGMACHINES.

No. 488,760; Patented Dec. 2'7, 1892.

a Nunms PETERS co., Wow-141140.v WASHINGTON, a. c.

UNrrnn STATES PATENT ()rrron.

PHILETU S WARREN GATES, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE GATES IRONWORKS, F SAME PLACE.

REMOVABLE TREAD FOR SCREENING AND ASSORTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 488,760, dated December2'7, 1892.

Application filed September 22 1892. Serial No. 446,571. (No model.)

To all whom it may concern.-

Be it known that I, PHILETUs WARREN GATES,acitizen of the UnitedStates,residing in Chicago, Illinois, have invented certain 5 new anduseful Improvements in Removable Treads for Screening and AssortingMachines, of which the following is a specification.

My invention is intended to be an improvement on the screening andasserting machines [0 shown and described in P. W. Gates Patent No.266,282, of October 24, 1882; and it consists in the features anddetails of construction hereinafter described and claimed.

In the drawings,Figure 1 is a side elevation of a screening andassorting machine containing myimprovement. Fig. 2 is an end view of aremovable tread; and Fig. 3 is alongitudinal section of the same, online 3 of Fig. 2.

In making my improved removable tread, I

use the usual screen and assorterA, supported in suitable bearings B, atone end of the frame B. Mounted on cross beams at the opposite end ofthe frame are the rolls 0, shown in dotted lines in Fig. 2, so that asthe screen and assorter revolves, itis supported, and the treadrevolves, on these rolls 0. The tread proper consists of two parts, A AA is bolted or secured to the framework of the screen and is made of anysoft metal, preferably cast iron,

which can be turned out to contain the flange a on the tread A, which isbolted to the ring or part A in any usual manner. It will thus be seenthat in using myimproved removable tread, the part A can be made ofchilled cast iron, and if, after using, it has been worn considerably orbroken, it can be readily removed and a new one replaced. In the presentform of construction, the pieces A A are made of one piece of chilledcast iron, but, having to be worked in constructing, it cannotbe chilledvery hard, so that even ordinary usage rapidly wears it away, and, whennecessary to replace the same by a new one, the entire machine or screenhas to be taken down and apart, thereby causing considerable loss oftime and expense, as well as the difficulty at tendant on getting it inperfect alignment again.

It will be seen that in making the tread of my improved form the part Acan be left soft, and the tread proper, A, can be made of very hardchilled cast iron or steel.

Having thus described my invention, what I claim and desire to secure byLetters Patent 1s:

The combination of a screening and assortas ing machine, a ring A? ofsoft metal, and a tread A of chilled cast iron or steel removablysecured to the same and adapted during the revolutions of the screen torotate on the rolls 0, substantially as described.

PHILETUS WARREN GATES.

Witnesses:

LEWIS J. HEWES, SAMUEL E. HIBBEN.

